[Bug 92181] [SKL] igt/kms_plane/plane-position-covered-pipe-b-plane-2 fail and cause system crash

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92181

--- Comment #14 from Matt Roper <matthew.d.roper at intel.com> ---
(In reply to Patrik Jakobsson from comment #13)
> I haven't tested in a week but last time I looked I found that this is a
> regression and bisected it to:
> commit 942840371cde152fe57c15e0e8483b760e7763e3
> Author: Matt Roper <matthew.d.roper at intel.com>
> Date:   Mon Sep 21 17:21:48 2015 -0700
> 
> It seems that at some point we're unreferencing a framebuffer that is in use.

Has fb reference counting always been an issue since this bug was opened back
in September or is that a relatively recent discovery?  I just fixed a bug that
could lead to refcount problems with
http://patchwork.freedesktop.org/patch/68713/ although I feel like that bug was
introduced too recently to be the original root cause here.  I'm wondering if
it could be multiple bugs contributing to the behavior seeing rather than a
single bug.

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